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Study on the Effect of Initial Delamination on Tensile Behavior of Offshore Wind Turbine Blade Spar Cap

Author

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  • Wen Xin

    (School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
    School of Mechanical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China)

  • Hui Li

    (School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China)

  • Xiaolong Lu

    (School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China)

  • Bo Zhou

    (School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China)

Abstract

Delamination damage to spar caps seriously endangers the operation safety of offshore wind turbines. The effect of initial delamination of various depths and areas on the ultimate tensile load of laminates is studied based on experiments and numerical simulation, and an effective method for predicting the residual tensile strength of laminates with high thickness is proposed. Three groups of initial delamination specimens with different characteristics were fabricated, and static displacement tensile tests were carried out. An accurate three-dimensional numerical analysis model was established, and the results were in good agreement with the experimental values, with the overall error of the failure load being less than 6%. Furthermore, a numerical model for a 20-ply high-thickness spar cap laminate was established to predict the effect of delamination on tensile strength. The results showed that, for the same depth of initial delamination, the difference in delamination area had little influence on the tensile strength. The dangerous locations of delamination were at the shallow surface and at the ratio of 0.3–0.4 in the thickness direction, and the maximum decrease in tensile strength was 14.86%; meanwhile, it was found that delamination on the middle surface had no significant effect on tensile strength.

Suggested Citation

  • Wen Xin & Hui Li & Xiaolong Lu & Bo Zhou, 2023. "Study on the Effect of Initial Delamination on Tensile Behavior of Offshore Wind Turbine Blade Spar Cap," Energies, MDPI, vol. 16(8), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3607-:d:1129805
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    References listed on IDEAS

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    1. Haselbach, P.U. & Bitsche, R.D. & Branner, K., 2016. "The effect of delaminations on local buckling in wind turbine blades," Renewable Energy, Elsevier, vol. 85(C), pages 295-305.
    2. Sun, Xiaojing & Huang, Diangui & Wu, Guoqing, 2012. "The current state of offshore wind energy technology development," Energy, Elsevier, vol. 41(1), pages 298-312.
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